CVE-2026-67294 | BDVDB-2026-354579 Detail

Description#

FreeRDP before 3.29.0 improperly validates the Extended Key Usage (EKU) purpose of the peer certificate during client-side server TLS authentication. In x509_utils_verify(), when server-purpose (X509_PURPOSE_SSL_SERVER) verification fails, the code falls back to client-purpose and any-purpose verification, so a trusted, hostname-matching certificate valid only for clientAuth can be accepted as the RDP server certificate. In environments relying on EKU separation between client and server certificates, this allows a clientAuth-only certificate issued by a trusted CA to bypass server certificate purpose validation.

Impact#

Weaknesses#

References#

Exploit#

History#

1. Version 12026-08-01Record published in the CVE List.
2. Version 22026-08-03Most recent update recorded in the CVE List.